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Differentially Amplitude- and Phase-Encoded QAM in Amplify-and-Forward Multiple Relay System Over Nakagami-m Fading Channels

Authors:
Chi-Hua Huang
Char-Dir Chung

Keywords: Amplify-and-forward relay, differential detection, Nakagami-m fading, star-QAM.

Abstract:
This paper studies the differentially amplitude- and phase-encoded (DAPE) quadrature amplitude modulation (QAM) for the amplify-and-forward multiple relay system over independent Nakagami-m fading links. A simple equal gain combining (EGC) receiver is proposed to noncoherently combine received signals from direct and multiple relay links and then detect the DAPE QAM signals without any link side information. Based on Beaulieu's series approach, an efficient bit error probability (BEP) upper bound computation formula is derived for the EGC receiver. Performance results show that the EGC receiver for DAPE QAM provides better BEP than the conventional receiver for differential phase shift keying modulation with the same constellation size.

Pages: 311 to 316

Copyright: Copyright (c) IARIA, 2012

Publication date: June 24, 2012

Published in: conference

ISSN: 2308-4219

ISBN: 978-1-61208-203-5

Location: Venice, Italy

Dates: from June 24, 2012 to June 29, 2012